diff --git a/catalog/src/test/resources/UsageExperimental.xml b/catalog/src/test/resources/UsageExperimental.xml
index 3d4e34d..d6e3f65 100644
--- a/catalog/src/test/resources/UsageExperimental.xml
+++ b/catalog/src/test/resources/UsageExperimental.xml
@@ -125,7 +125,7 @@
<unit>minutes</unit>
<block>1000</block>
<prices>
- <!-- could be either fixed or recurring:
+ <!-- could be either fixed (with NO_BILLING_PERIOD) )or recurring:
* In the case of fixed price, we buy one block of units
* In the case of recurring price, we buy one block of units for each period
-->
